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It is possible to be allergic to your own blood. Learn more about the condition at HowStuffWorks.

It's possible to have surgery to change your eye color, but it's not without risks. Learn more at HowStuffWorks.

Movie villains aren't the only ones who cry blood. Learn whether it is possible to cry blood at HowStuffWorks.

Many allergies develop later in life. Learn whether it is possible to make yourself allergic to something at HowStuffWorks.

Your tongue is attached pretty well to the floor of your mouth. Learn whether it is really possible to swallow your tongue at HowStuffWorks.

Death is a fact of life. Since the beginning of time humanity has come up with numerous superstitions to come to terms with the dearly departed.

Rice that hasn't been reheated can inflict serious damage on your body. HowStuffWorks looks into whether eating cold rice can kill you.

Ghost peppers were once used to make grenades. So if you eat a ghost pepper, will it kill you? Find out.

If you're aware you're dreaming and you face certain death, does the real you die when the dream you does? Find out if lucid dreams can kill.

Holding in a sneeze is necessary in some situations, but can that be dangerous? Find out if holding in a sneeze can kill you.